I predicted the pick. I said in detail afterwards why I thought it was a good pick. I've predicted good things from Brown in the future.
I don't place much stock in Summer League. SL will tell you who does NOT belong in the NBA, not who does or what they'll do. It's geared towards small, quick players because the defensive schemes are so basic, there's little rotation and the interior players usually aren't defensive-oriented.
With that all said, what I've found that you can take from SL are physical flashes from a player. Anyone can get hot from 3 point land for 3-4 games and make the box score look great. But a true SL evaluation deals with basic man-up defense, how a player puts the ball on the floor, physicality, how soft someone's hands are, etc. Brown showed a lot of positives out there. He showed a decent ability to put the ball on the floor and drive the lane (though his handle needs to improve). He showed great ability to draw contact while using his forearm to keep other players off of him. He showed fast, soft hands. He showed a tremendous lateral leaping ability while still maintaining good vertical height. I thought he rebounded better in SL than in college.
At times he looked bad and it was often due to him trying to do too much. When he got rushed his handle on the ball was really off. He has got to learn as a rookie to play in his comfort zone and then expand that zone slowly. He needs to find his spots on the floor where he's comfortable shooting. His finishing ability at the rim needs to improve by not rushing his shots as he's driving the lane. But overall he showed considerable positive flashes of what he could - and should - become as he gets older.
In conclusion Brown made a positive case in SL as to why he was the #3 overall pick. I expect him to struggle this year but I think he may be closer to contributing than anyone suspects.